STMicroelectronics L5957PDTR

Overview

L5957PDTR from STMicroelectronics is a multifunction automotive voltage regulator IC integrating four independent LDO regulators (8.5 V/500 mA, 5 V permanent/300 mA, 5 V/800 mA, 3.3 V/800 mA) and a 2 A high-side power switch, with ignition monitoring, reset generation, load dump protection, and thermal shutdown - deployed in car radio head units for centralized power management.

For engineers reviewing the L5957PDTR datasheet, L5957PDTR pinout, L5957PDTR application, or L5957PDTR equivalent, this device serves as a system-level power hub requiring precise sequencing, battery voltage supervision (IGNIN, HOLD), low-quiescent-current standby operation (<70 µA), and robust fault handling in 12 V automotive environments.

Technical Context

The L5957PDTR integrates four linear regulators with independent enable controls (ENREG1–4, ENREG3), a push-pull reset buffer (RES/CRES), an ignition comparator with Schmitt-trigger hysteresis (IGNIN → IGNOUT), and a thermally protected high-side switch (SW) with 15–45 ms delay on overcurrent. All regulators feature 50 dB PSRR at 1 kHz and ≤100 mV load/line regulation.

It implements dual-threshold VIN1 monitoring (9.5 V low-detect, 20 V high-detect) for HOLD signal generation, supports backup capacitor timing via CRES (10–60 ms reset delay), and includes internal current limiting (0.6–2 A) and drop-out voltage control (0.6–2.65 V) per regulator - enabling direct integration into infotainment power trees without external supervisors or sequencers.

Key Specifications

Pinout & Package

Package: PowerSO20 (slug up), thermally enhanced surface-mount package with exposed die attach pad for PCB heatsinking - R_{th j-case} = 1.5 °C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multifunction automotive regulator applications.

Compared with TLE4271-2G and UC2843BD1R2G, the L5957PDTR uniquely combines quad-LDO regulation, high-side switching, ignition sensing, and reset generation in one automotive-qualified package - enabling single-chip power architecture for cost- and space-constrained car radios.

Availability

L5957PDTR is available at Aetrix Electronics and suitable for automotive infotainment systems, OEM head unit designs, and industrial vehicle-mounted displays requiring stable component supply, long-lifecycle support, and AEC-Q100-aligned reliability.

Supply support for L5957PDTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets since 1987.

The L5957PDTR belongs to ST's Automotive Power IC product line - engineered specifically for centralized power management in car radios, navigation systems, and telematics units with stringent quiescent current, transient immunity, and functional safety requirements.

FAQ

What is the maximum allowable input voltage for VIN1 and VIN2?

VIN1 supports DC operating voltage up to 30 V and transient pulses up to 50 V per absolute maximum ratings; VIN2 operates from 6 V to 18 V with 22 V load dump tolerance. Both inputs are protected against ISO 7637-2 Pulse 5a transients, eliminating need for external TVS diodes in standard automotive deployments.

How does the ignition comparator function with IGNIN and IGNOUT?

The IGNIN pin accepts 0–50 V and compares it against internal thresholds: falling edge triggers at 1.03–1.28 V, rising edge at 1.18–1.33 V, with 30–100 mV hysteresis. IGNOUT is a push-pull output that drives external logic or MCU GPIO, enabling ACC/IGN state detection without external comparators or pull-ups.

Can the L5957PDTR be used without external capacitors on its regulator outputs?

No - each regulator requires external output capacitors (5–100 µF, ESR 0.5–10 Ω) for stability and transient response. Figure 4 specifies maximum ESR limits; omitting them causes oscillation or poor load regulation. Ceramic or low-ESR tantalum types are recommended per ST application note AN2717.

Is the L5957PDTR qualified for automotive applications per AEC-Q100?

Yes - the L5957PDTR is AEC-Q100 Grade 2 qualified (–40 °C to +105 °C ambient), with design, testing, and packaging meeting automotive reliability standards. Its PowerSO20 package features ECOPACK® environmental compliance and is specified for use in car radio systems per ST's automotive product roadmap.